JSP using Hibernate and Spring MVC - spring

Question

Good day!
When i deploy war to tomcat it drop to me this exception:
May be someone can help solve that problem with #Transactional annotation, cannot solve that problem in above 2 weeks :(
n22-Feb-2018 14:52:54.125 SEVERE [http-nio-8080-exec-11] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [dispatcher] in context with path [/page] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at com.mycompany.app.controller.TypeController.listAll(TypeController.java:24)
at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:871)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:777)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
web.xml
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
mvc-dispatcher-servlet.xml
<context:component-scan base-package="com.mycompany.app" />
<context:component-scan base-package="com.mycompany.app.controller" />
<context:component-scan base-package="com.mycompany.app.service" />
<mvc:annotation-driven />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
TypeController.java
#Controller
public class TypeController {
private TypeServiceImpl typeService;
#RequestMapping(value = "/main")
public String listAll(Map<String, Object> map) {
map.put("type", new Type());
map.put("typeList", typeService.listAll());
return "index";
}
#RequestMapping("/")
public String home() {
return "redirect:/main";
}
#RequestMapping(value = "/add", method = RequestMethod.POST)
public String add(#ModelAttribute("type") Type type, BindingResult bindingResult) {
typeService.add(type);
return "redirect:/main";
}
#RequestMapping(value = "/delete/{id}")
public String deleteType(#PathVariable("id") Integer id) {
typeService.delete(id);
return "redirect:/main";
}
}
TypeServiceImpl.java
Dont using DAO
#Service
public class TypeServiceImpl implements TypeService {
private SessionFactory sessionFactory;
#Override
#Transactional
public void add(Type type) {
sessionFactory.getCurrentSession().save(type);
}
#Override
#Transactional
#SuppressWarnings("unchecked")
public List<Type> listAll() {
return sessionFactory.getCurrentSession().createQuery("from Type").list();
}
#Override
#Transactional
public void delete(Integer id) {
Type type = sessionFactory.getCurrentSession().load(Type.class, id);
if (type != null) {
sessionFactory.getCurrentSession().delete(type);
}
}
}
Type.java
#Entity
#Table(name = "type")
public class Type {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id_type")
private Integer id_type;
#Column(name = "type_name")
private String type_name;
// Communication with Event
#OneToMany(fetch = FetchType.LAZY, mappedBy = "type")
private List<Event> event;
public Type() {
}
public Type(Integer id_type, String type_name) {
this.id_type = id_type;
this.type_name = type_name;
}
//Default getters and setters
}
index.jsp
<%#taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<%#taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%#taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%# page contentType="text/html;charset=UTF-8" language="java"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello World Page</title>
</head>
<body>
<form:form method="post" action="add" modelAttribute="type">
<table>
<tr>
<td><form:label path=id_type>Type's ID</form:label></td>
<td><form:input path="id_type" /></td>
</tr>
<tr>
<td><form:label path=type_name>Type name</form:label></td>
<td><form:input path="type_name" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Submit" /></td>
</tr>
</table>
</form:form>
<h3>Types</h3>
<c:if test="${!empty typeList}">
<table class="data">
<tr>
<th>Type ID</th>
<th>Type Name</th>
<th> </th>
</tr>
<c:forEach items="${typeList}" var="type">
<tr>
<td>${type.id_type}}</td>
<td>${type.type_name}</td>
<td>Delete</td>
</tr>
</c:forEach>
</table>
</c:if>
</body>
Thanks for watching!!!

Answer 1

I think you might be missing an #Autowired annotation for your service.
#Autowired
private TypeService typeService;
At the moment i can't see where your instantiating the service class.